PHP mysqli is NOT trapping some errors when calling stored procedure

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Can you take a look at the issue that I've described at
https://stackoverflow.com/questions/54643704/php-mysqli-is-not-trapping-some-errors-when-calling-stored-procedure
and tell me what I am missing in my PHP code ?

To summarize: I am calling a MySQL stored procedure from PHP that does some
DMLs (using mysqli). But the problem is that PHP is not able to get
intimated of some database error conditions raised by the stored proc
(which I know are raised, bcoz they do get flagged when invoked from a
mysql client)

I've listed the relevant code fragments there. Am I not using mysqli
correctly?

Thanks,
Venkat

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